中文摘要：

长期的被动来源海洋底部地震计(OBS ) 天文台由于各种各样的技术困难是挑战性的。为了在这块地里获得经验，并且揭示 lithospheric，在中央华南海(SCS ) 在绝灭的垅下面组织，我们执行了一个被动来源 OBS 数组在 SCS 的深部分的实验，包括 18 OBS，。这里我们在场乐器学， OBS 推广和这的恢复试验，并且更重要地，数据质量由很多条途径评估了。通过从全球、地区性、本地的地震处理并且检查波形，我们发现大多数恢复 OBS 与看得清的主要阶段有好数据质量。OBS 记录的周围的噪音分析证明他们的噪音比全球一般水准高，并且水平部件比吵闹垂直，显示水平部件上的当前的影响是更严重的。在 510 的时期范围 ? s，有一张噪音槽口因为水平部件的 SCS OBS，和噪音层次比得上垂直。这个特征，没在开的海洋在 OBS 车站被看见，建议为在这个边缘的海的两倍频率微震的远来源不是重要的。另外，我们成功地决定为由调查他们的瑞利的 7 OBS 的取向挥动极化；并且我们通过频率时间分析表明了瑞利波浪的分散特征。最后，我们总结了在 SCS 关于被动来源 OBS 调查从这个实验接受的教训。

英文摘要：

Long-term passive source ocean bottom seis- mograph （OBS） observatory is challenging due to various technical difficulties. In order to gain experience in this field, and to reveal the lithospheric structure beneath the extinct ridge in the central South China Sea （SCS）, we carried out a passive source OBS array experiment, which includes 18 OBSs, in the deep portion of SCS. Here we present the instrumentation, the OBS deployment and recovery of this experiment, and more importantly, the data quality evaluated by a number of approaches. Through processing and inspecting waveforms from global, regional and local earthquakes, we find that most of recovered OBSs have good data quality with discernible main phases. The ambient noise analyses of OBS recordings show that their noise is higher than the global average, and the horizontal component is noisier than the vertical, indicating current impacts on horizontal components are more severe. In the period range of 5-10 s, there is a noise notch for the SCS OBSs, and noise levels of horizontal components are comparable to the vertical. This feature, which is not seen at OBS stations in open ocean, suggests the distant sources for double frequency microseism in this marginal sea are not significant. In addition, we successfully determined the orientations for 7 OBSs by investigating their Rayleigh wave polarizations; and we demonstrated the dispersion feature of Rayleigh waves through the frequency-time analysis. Finally, we summarized lessons learned from this experiment regarding the passive source OBS investiga- tions in SCS.